Is a Brinsea 10 more likely to have stable temp than LG 9200?

I bought an LG, and ran it for several days until I thought the temp was stable, then put in 10 eggs.
Weather has been both hotter and colder since then, with temp found @ 104 *yikes* and 97. The max stored reading was 123, which I sincerely hope was before I placed these eggs. I forgot to clear it on set day.
We do not have central air, so house temp varies. I have some sheets of Styrofoam I can put around it, if that will help.
Humidity has not been a problem; 55-65%; I put plastic Easter eggs in to hold more water. (what happens if it's high in the beginning?)
There is a Brinsea 10 available; if it will hold temps better I may try it. 10 egg limit would be good for me.
I appreciate all ideas!

Go with the RCom! I just got the rcom king suro 20 and have eggs set right now, getting close to hatch time it has been completely hands free and CONSTANT temp/humidity all of my eggs are doing wonderfully - I honestly can't say enough about this incubator!!!!

I set 10 Cream Brabanter eggs on Wednesday, in an LG, but they spiked to 104 on Thursday, so I may need to start over.
I will post results here https://www.backyardchickens.com/forum/viewtopic.php?id=246395
zomg the Brinsea 10 (a discontinued item) on ebay went for $149. You can get a 20 for only a little bit more than that. Still I would love to have had it.
The Rcom is calling me, lol.